Rx7 cooling problems
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Joined: Jul 2011
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From: Europe
Rx7 cooling problems
I've purchased an Rx7 1992 model that had a total engine rebuilt 5 months ago from a reputable shop.
The following symtoms are evident:
After 1hr of driving, the temperature goes from middle to near red line!
When I try (from a cold start) and switch it to idling in garage only, after 10 mins (when the cooling fans turn on), coolant gushes out of the over flow tank.
I burp the system bu to no avail. I know that the previous owner installed an aluminum radiator after the rebuilding has been done.
What could be the problem?
The following symtoms are evident:
After 1hr of driving, the temperature goes from middle to near red line!
When I try (from a cold start) and switch it to idling in garage only, after 10 mins (when the cooling fans turn on), coolant gushes out of the over flow tank.
I burp the system bu to no avail. I know that the previous owner installed an aluminum radiator after the rebuilding has been done.
What could be the problem?
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 6
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From: Europe
Yes stock temparature gauge. I also have a standard AST with the pressure cap on it.
I went to the mechanic today, we changed the radiator cap again with a different psi tollerance. I took it for a spin (30mins) after it was around 10mins idling.
I parked it in the garage (still idling), not one single drop from the overflow tank. When I switched the rx7 off, I heared boiling/churning sounds, and quarter of the coolant gushed out from the oferflow.
Are the water seals the main culprit?
I went to the mechanic today, we changed the radiator cap again with a different psi tollerance. I took it for a spin (30mins) after it was around 10mins idling.
I parked it in the garage (still idling), not one single drop from the overflow tank. When I switched the rx7 off, I heared boiling/churning sounds, and quarter of the coolant gushed out from the oferflow.
Are the water seals the main culprit?
If you've seen the stock gauge get to near "red-line" then you've seriously overheated the engine and likely damaged a coolant seal. A failed/damaged coolant seal would then explain the pressurized and overflowing over-flow tank.
The high-pressure cap that was installed at the garage isn't going to help and the boiling sounds you hear at shut down is a result of heat-soak and air in the system. This in-turn will cause more temp spiking. From here it's probably going to be a continued cycle of overheating until a rebuild for the coolant seals.
The stock gauge is not linear and once it moves from just under the half-way mark it's almost too late. Get an aftermarket gauge. And stop if it ever get's past about 110 C.
The high-pressure cap that was installed at the garage isn't going to help and the boiling sounds you hear at shut down is a result of heat-soak and air in the system. This in-turn will cause more temp spiking. From here it's probably going to be a continued cycle of overheating until a rebuild for the coolant seals.
The stock gauge is not linear and once it moves from just under the half-way mark it's almost too late. Get an aftermarket gauge. And stop if it ever get's past about 110 C.
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